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The True Definition of Calories i.e. "Why what you believe is extremist BS"

But some skinny people consume 5k calories per day way over their BMI and still don't gain weight.

Consuming 5k calories a day is easy through sweets soft drinks etc

I think you mean TDEE.

And, in most cases, these "skinny people" are simply not eating as much as you think - unless you follow them all day, every day for a week/month and log their intuitive caloric intake. It is rare to find people with such sky-rocketing high metabolisms.

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My son has always been a good example of the skinny kid that appears to eat anything he wants. He has always been athletic, playing soccer and other sports. If you saw him at dinner time at home or after a game, he would be eating an entire Jumbo Jack Combo, plus dessert. That's a huge bacon cheeseburger, giant curly fries, large soda and ice cream or whatever he decided. Besides that, he probably only had a bowl of cereal that day. Total calories was still pretty low based on his activity level, thus he remains skinny. He never really at much until dinner time, so it was basically a form of intermittent fasting.

On the other hand, my best friend while growing up also ate "whatever he wanted". He started the day with chocolate milk, donuts and bacon and eggs. Ate fast food for lunch and dinner, snacked and drank sodas in between and was morbidly obese by his teenage years. He also played football, but all those calories outweighed his activity.

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But some skinny people consume 5k calories per day way over their BMI and still don't gain weight.

Consuming 5k calories a day is easy through sweets soft drinks etc

This is not easy at all. 2k calories in sodas alone is the equivalent of 10 16oz sodas. So on top of that, a person would have to eat another 3k in food and several more sodas. Sure, some people may do that, but it's not a "skinny" person unless we are talking about Michael Phelps that works out 6 hours per day.

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Living organisms are regulated by feedback paths. Paths, plural. Many feedback systems. When you adjust a parameter (e.g. CI) a great many other parameters adjust in the background according to the organism's inborn feedback controls. These controls evolved, which means their one criteria is successful reproduction in whatever conditions existed when they evolved. They don't have to be good or make sense, they just had to increase the odds of successful reproduction at some point.

That makes for an insanely complicated set of relationships. People who have actually worked with feedback systems (engineers, some scientists, a few others) understand just how complicated the behavior of a single feedback system can be. Layered feedback is exponentially more complex. Most people are just flat-out ignorant and will catastrophically underestimate the complexity...as demonstrated by some posters on this thread.

This is where I feel we need to be aware of the fact that foods from nature have a corresponding complexity to our bodies. Regardless of how advanced we think we are, the complexities of nature are largely still beyond our understanding.

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This is not easy at all. 2k calories in sodas alone is the equivalent of 10 16oz sodas. So on top of that, a person would have to eat another 3k in food and several more sodas. Sure, some people may do that, but it's not a "skinny" person unless we are talking about Michael Phelps that works out 6 hours per day.

1 Large pizza is anywhere between 2500-3000 calories on its own, some of my friends that eat healthy and usually average between 4000 - 4500 calories per day, one for instance is a personal trainer he mentioned he eats 4500 daily.

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1 Large pizza is anywhere between 2500-3000 calories on its own, some of my friends that eat healthy and usually average between 4000 - 4500 calories per day, one for instance is a personal trainer he mentioned he eats 4500 daily.

The standard response is that everyone who does not respond according to the prediction of a single simple mathematical model comparing the human body to a bomb calorimeter is either delusional or lying. There's no point in arguing biochemistry with people fixated on arithmetic.

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1 Large pizza is anywhere between 2500-3000 calories on its own, some of my friends that eat healthy and usually average between 4000 - 4500 calories per day, one for instance is a personal trainer he mentioned he eats 4500 daily.

Go for it. Eat 4-5k calories of healthy food, and you should be as successful as that trainer. However, for my clients, it's consistent that they need to eat less food rather than more. Most lifestyle coaches that I talk to find that to be the same with their clients. I am sure there can be rare outliers and exceptions.